AISI4140 seamless tube
Comparison table of seamless steel pipe materials
Production process:
① Main production processes of hot rolled seamless steel tubes (△ main inspection processes): tube blank preparation and inspection △ → tube blank heating → perforation → tube rolling → steel tube reheating → sizing (reducing) → heat treatment △ → finished tube straightening → finishing → inspection △ (nondestructive, physical and chemical, bench inspection) → warehousing
② The main production process of cold rolled (drawn) seamless steel pipe: blank preparation → acid pickling and lubrication → cold rolled (drawn) → heat treatment → straightening → finishing → inspection
Generally, the production process of seamless steel pipe can be divided into cold drawing and hot rolling. The production process of cold-rolled seamless steel pipe is generally more complex than hot rolling. The pipe blank must first be subject to three roll continuous rolling, and the sizing test must be carried out after extrusion. If the surface does not respond to the crack, the round pipe must be cut by a cutter, and the billet with a length of about one meter must be cut.
Then enter the annealing process. Acid pickling is required for annealing. During acid pickling, pay attention to whether there is a large number of bubbles on the surface. If there is a large number of bubbles, it means that the quality of steel pipes cannot meet the corresponding standards.